题目

阅读理解Samis a fourth-year student at Harvard Medical School, but poetry is still abig part of his life, nowwith a new teacher, RafaelCampo, whobelieves poetry can benefit every doctor's education and work. Rafael is aphysician, professorand a highly respected poet. Poetryis in every encounter(邂逅)withmy patients. I think healing is really in a very great way about poetry. And ifwe do anything when we're with our patients, we're reallyimmersing(使沉浸于)ourselvesin their stories, reallyhearing their voices. And, certainly, that's what a poemdoes, hesaid. Rafaelworries that somethin下列方程中是一元二次方程是（　　）A．1x2+x=2B．2x+6=7C．x2+y2=5D．3x2-5x+2=0